2015 (4) 4

https://doi.org/10.15407/polymerj.37.04.354

Effects of polyurethane polymer polarity on spectral and photophysical properties of phenalenone dyes. Dipole moment estimations for the ground and excited states

L.F. Kosyanchuk2, M.S. Stratilat2, N.V. Kozak2, T.V. Bezrodna1

1Institute of Physics NAS of Ukraine

46, Nauki prospeckt, Kyiv, 03680, Ukraine

2Institute of Macromolecular Chemistry NAS of Ukraine

48, Kharkivske shose, Kyiv, 02160, Ukraine

Polym. J., 2015, 37, no. 4: 354-361.

Section: Structure and properties.

Language: Russian.

Abstract:

Effects of polyurethane matrix polarity on the spectral and photophysical properties of three widely used laser phenalenone dyes were investigated. To estimate the dipole moments in the ground and excited states in a system of singlet levels, Bakshiev’s method and Kawski – Chamma – Viallet’s equations were applied. The dipole moments for phenalenone dyes were found to be higher in the excited state, than in the ground one. The increase of Stokes bathochromic shift with growth of polyurethane matrix polarity indicated significant redistribution of p-electron density in the excited state. Dielectric permeability, being a physical characteristic feature of the polymer matrix, was shown to play a crucial role in the growth of dye photostability.

Keywords: photophysical properties, phenalenone dyes, the dipole moments, Stokes bathochromic shift.

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